<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 行 -->
      <el-row>
        <!-- 列 -->
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 利用栅格系统 -->
            <el-row
              :class="['bdbottom',i1 === 0 ? 'bdtop' :'','vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row
                  :class="[i2===0 ? '' : 'bdtop','vcenter']"
                  v-for="(item2,i2) in item1.children"
                  :key="item2.id"
                >
                  <!-- 二级权限渲染 -->
                  <el-col :span="6">
                    <el-tag
                      closable
                      @close="removeRightById(scope.row,item2.id)"
                      type="success"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 三级权限渲染 -->
                  <el-col :span="18">
                    <el-tag
                      v-for="(item3,i3) in item2.children"
                      :key="item3.id"
                      type="warning"
                      closable
                      @close="removeRightById(scope.row,item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column lebel="角色名称" prop="roleName"></el-table-column>
        <el-table-column lebel="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column lebel="操作" width="300px">
          <!-- 作用域插槽 -->
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-search">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-search">删除</el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-search"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisivle"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightslist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>

      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisivle = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      //   控制分配权限对话框的显示与隐藏
      setRightDialogVisivle: false,
      //   所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: "authName",
        // 分子之间的嵌套
        children: "children"
      },
      // 默认选中的节点ID值数组
      defKeys: [],
      // 当前即将分配权限 角色的ID
      roleId: ""
    };
  },
  //   生命周期函数中发送请求
  created() {
    this.getRolesList();
  },
  methods: {
    //   获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取角色列表失败");
      }
      this.rolelist = res.data;
      //   console.log(this.rolelist);
    },
    // 根据ID删除对应的权限
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该文件, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      if (confirmResult !== "confirm") {
        return this.$message.error("取消了删除!");
      }
      //   console.log("确认删除");
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除权限失败");
      }
      //   this.getRolesList();
      role.children = res.data;
    },
    // 展示分配权限对话框
    async showSetRightDialog(role) {
      this.roleId = role.id;
      // 获取所有权限数据
      const { data: res } = await this.$http.get("rights/tree ");

      // 调用递归获取三级节点的ID
      this.getLeafKeys(role, this.defKeys);

      this.setRightDialogVisivle = true;
      if (res.meta.status !== 200) {
        return this.$message.error("获取权限数据失败");
      }
      //   获取成功,把获取到的权限数据保存到data  rightslist 中,供页面使用
      this.rightslist = res.data;
      console.log(this.rightslist);
    },
    // 通过递归的形式，获取角色下所有三级权限的ID，并保存到defKeys
    // node:节点  arr:数组
    getLeafKeys(node, arr) {
      // 如果当前的node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id);
      }
      // 如果没有return 说明还不是三级节点，需要调用递归来获取到最终的三级节点
      // 循环node当中的所有数组，每循环一项，拿到一个子节点item，根据这个item再次调用递归函数，把当前的item当作一个节点传进去，同时arr也传进去，这样只要递归完毕之后就把所有的三级节点ID保存到了arr数组中

      node.children.forEach(item => this.getLeafKeys(item, arr));
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = [];
    },
    // 点击角色分配权限
    // ...展开运算符
    async allotRights() {
      const keys = [
        // 全选的id
        ...this.$refs.treeRef.getCheckedKeys(),
        // 半选的id
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ];
      // console.log(keys);
      // 将id以逗号拼接的字符串
      const idStr = keys.join(",");
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("分配权限失败");
      }
      this.$message.success("分配权限成功");
      this.getRolesList();
      this.setRightDialogVisivle = false;
    }
  }
};
</script>

<style lang="less" scoped>
.el-row {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>